[from wart by analogy with
misbug] A feature that
superficially appears to be a wart but has been
determined to be the Right Thing. For example, in
some versions of the EMACS text editor, the
‘transpose characters’ command exchanges the character under
the cursor with the one before it on the screen,
except when the cursor is at the end of a line, in
which case the two characters before the cursor are exchanged. While this
behavior is perhaps surprising, and certainly inconsistent, it has been
found through extensive experimentation to be what most users want. This
feature is a miswart.